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It depends on the size of the system not the size of the house. RRA2 is good for up to 200 devices (2 main repeaters). And I believe 4 aux repeaters per main repeater. Depending on the size and shape of course but that could be a pretty huge house. We have a system we are installing in a 8,000 square ft house. Only in common areas and master suite. 1 main and 2 aux repeaters. It's only something like 50 devices. HW would be total over kill.

Is each seeTouch/seeTemp keypad, fan control, dimmer, occupancy sensor considered a device? How about the individual switches per circuit hidden in the closet? Would like to be able to estimate the number of devices needed. Sorry for the fundamental questions. I will take the RRA2 training soon.

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